List essential drugs in primary health care, detailing dosage, action, interactions, contraindications, and abuse potential.

Here is a list of essential drugs used in primary health care, including their dosage, mode of action, interactions, contraindications, and potential for drug abuse.

• Paracetamol (Acetaminophen)

  • Dosage: Adults typically take 500 mg to 1000 mg every 4-6 hours, not exceeding 4000 mg in 24 hours.
  • Mode of Action: Primarily acts in the central nervous system by inhibiting prostaglandin synthesis, leading to analgesic (pain-relieving) and antipyretic (fever-reducing) effects.
  • Interactions: Increased risk of liver damage with chronic alcohol use. High doses over prolonged periods can enhance the effect of oral anticoagulants like warfarin.
  • Contraindications: Severe liver disease or known hypersensitivity to paracetamol.
  • Drug Abuse: Low potential for abuse. However, overdose can cause severe and potentially fatal liver damage.

• Amoxicillin

  • Dosage: Adults typically take 250 mg to 500 mg every 8 hours, or 500 mg to 875 mg every 12 hours, depending on the infection.
  • Mode of Action: A beta-lactam antibiotic that inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins, leading to bacterial cell lysis and death.
  • Interactions: May reduce the effectiveness of oral contraceptives. Probenecid can increase amoxicillin blood levels.
  • Contraindications: Known hypersensitivity or allergic reactions to penicillins or other beta-lactam antibiotics.
  • Drug Abuse: No known potential for abuse. Misuse, such as taking for viral infections, contributes to antibiotic resistance.

• Oral Rehydration Salts (ORS)

  • Dosage: One sachet is typically dissolved in 1 liter of clean water. Administer frequently in small sips, with the amount depending on the patient's age and degree of dehydration.
  • Mode of Action: Replaces lost fluids and electrolytes (sodium, potassium, chloride, citrate) and provides glucose, which facilitates water absorption in the intestine to correct dehydration caused by diarrhea.
  • Interactions: Generally no significant drug interactions, as it is an electrolyte solution.
  • Contraindications: Intestinal obstruction, paralytic ileus, or severe vomiting that prevents oral intake.
  • Drug Abuse: No potential for abuse.